Defy Gravity! Centripetal Force According to Newton's law of inertia, an object already moving will continue to move in a straight line at a constant speed unless acted on by an outside force. Thus, to make an object move in a circular path, an outside force must act on the object. Centripetal force is the force that pushes or pulls an object inward so that it will move in a circular path. The word centripetal means to seek the center. When you whirl a stone tied to a string in a circle, you must constantly pull on the string to keep the stone from flying off in a straight line. In the initial demonstration of this segment from ZOOM, involving a cylindrical container, as the ball rolls around the inside of the cylinder walls, a centripetal force continually redirects it to the center of the cylinder. With the second container, a pitcher with a wide body that curves inward near the lip, the ball does not drop out of the opening.
Victorian Flea Circuses: A Lost Art Form "QUANTUM SHOT" #549Link - by A. Abrams If you can make a flea cooperate with you, you're probably good at politics I have to say, this is probably the strangest subject we ever talked about on Dark Roasted Blend. However, it is such a rich showcase of miniature art and craftmanship, and the "wow" factor is there as well: A flea, with legs finer than a human hair, can pull up to 700 times its own weight! (art credit: Leah Palmer Preiss) "Big fleas have little fleas... Andy Clark sends us his latest project - he's been researching this topic for about four years now and regularly publishes new discoveries along with other flea news on the Flea Circus Research Library blog. "The idea to make a Victorian Flea Chariot came to me when I wondered if it's possible to use simple techniques available in the 1800s to make one today. The chariot is approx 10mm long by 7mm wide and made from brass; the wheels are 5mm in diameter. Making the chariot can be seen here, with video of a final product. ...
ARKive - Discover the world's most endangered species Wildscreen's Arkive project was launched in 2003 and grew to become the world's biggest encyclopaedia of life on Earth. With the help of over 7,000 of the world’s best wildlife filmmakers and photographers, conservationists and scientists, Arkive.org featured multi-media fact-files for more than 16,000 endangered species. Freely accessible to everyone, over half a million people every month, from over 200 countries, used Arkive to learn and discover the wonders of the natural world. Since 2013 Wildscreen was unable to raise sufficient funds from trusts, foundations, corporates and individual donors to support the year-round costs of keeping Arkive online. Therefore, the charity had been using its reserves to keep the project online and was unable to fund any dedicated staff to maintain Arkive, let alone future-proof it, for over half a decade. Therefore, a very hard decision was made to take the www.arkive.org website offline in February 2019.
Lessons Learned using VoiceThread for iPad <div class="greet_block wpgb_cornered"><div class="greet_text"><div class="greet_image"><a href=" rel="nofollow"><img src=" alt="WP Greet Box icon"/></a></div>Hello there! If you are new here, you might want to <a href=" rel="nofollow"><strong>subscribe to the RSS feed</strong></a> for updates on this topic.<div style="clear:both"></div></div></div> (Cross-posted from Playing with Media) The free VoiceThread for iPad app has been available for awhile, but this afternoon was the first opportunity I’ve had to play with it at length. Rachel, my 8 year old daughter, just finished reading “Christmas in Camelot” (a Magic Treehouse book) this weekend and was VERY excited to tell me all about it. This advice comes as no surprise to writing teachers. Have you played with the VoiceThread iPad app yet?
physicscentral Newton's Third Law of Motion: Astronauts in Outer Space One of NASA's first attempts at a "space walk" turned into an exhausting failure for astronaut Gene Cernan. Unlike astronauts who had "walked" in space on previous missions, Cernan had several tasks to accomplish outside the spacecraft. However, every time he attempted to push or turn a valve, he was sent hurtling in the opposite direction, with little control over his trajectory. After many exhausting minutes, his mission outside the capsule was called off, and NASA scientists began trying to figure out what went wrong. NASA scientists and engineers should probably have predicted that if an astronaut applied force to open or close a valve, the valve would apply the same amount of force to him, but in the opposite direction. After all, nearly 300 years ago, Isaac Newton presented what came to be known as his third law of motion, which says that for every action there is an equal and opposite reaction.
The Earth and Beyond Welcome to The Earth and Beyond Hello, my name is Tim O'Brien. I'm an astronomer working at The University of Manchester's Jodrell Bank Observatory. As an astronomer my job is to try and understand how the universe works and my main interest is why some stars explode - more about this later! I also get to visit lots of schools and share amazing facts with children and teachers about the Sun, Earth and Moon, the stars and planets, and the Universe as we know it! Exploding stars You may know the names of some patterns of stars (called constellations) such as Orion or the Great Bear. This picture shows Orion the Hunter and Taurus the Bull with the position of an exploded star known as the Crab Nebula. We're all made of stars Understanding why stars explode is very important because most of the chemical elements (carbon, oxygen, nitrogen and so on) were made inside stars and are spread out into space when they explode. Learn about astronomy Good luck with your studies!
DOWNLOAD How To Use Evernote: The Missing Manual Table Of Contents §1 – What Is Evernote? §2 – An Overview Of The Desktop App §3 – An Overview Of The Smartphone Apps §4 – Tips, Tricks & Hacks §5 – Evernote Add-Ons / Plugins §6 – Conclusion 1. Why do you want to use Evernote? I see so many advantages to Evernote and we will explore some of them in depth later. As information becomes more plentiful, we are bombarded with relentless forms of media 24/7, such as blog posts, videos and photos. Your brain, amidst all this mess and disorder, just can’t keep up with what it has to remember. Here is a brief rundown of the features that could make your digital life a lot easier, and how to use Evernote to do just that. Find Anything, Anytime, Anywhere Evernote has its own OCR (Optical Character Recognition) service which means that it can read text, whether it’s computer keyboard text, text in a PDF document, a photocopy of some text (say a page of a book) or even text in a photograph. Evernote provides all users with their own unique email address.
www.physicscentral.com/explore/einstein/index.cfm A New World View A New World View is a tribute to the World Year of Physics 2005. The artists designed A New World View to challenge and inspire today's children to build on the science of the past and be a part of the science of the future. Einstein's Miracle Year Einstein's Miracle Year is an award-winning movie that celebrates the three revolutionary ideas that Albert Einstein presented in 1905. World Year of Physics The World Year of Physics (WYP 2005) was a worldwide celebration of physics.